Toshiba Strata DK 280 Installation Manual page 138

130V P-P W1 jumper, like the PSTUl and PSTU2
do. In its standard configuration, the RSTU
provides an 80-volt sine wave ring generator. An
optional R48S unit can be connected to the RSTU
to increase the loop voltage from -24V to -48V,
extending the loop length (including the resistance
of the phones) from 600 ohms to 1200 ohms.
message waiting generator to drive standard
telephone 9OV message waiting lamps. Only one
telephone per RSTU2 port.
Standard telephones and other devices, except for the
BGM, can be connected to any circuit on the RSTU,
connected to circuit 2.
in Figure 4-19, and RSTU controls, indicators, and
interface connectors are shown in Figure 4-20. The
controls, indicators, and interface connectors of each
of the PSTU versions and the RSTU are described in
Table 4-1 3.
Note:
For the system to recognize the DTMF tones
generated by a standard telephone (or any
other device connected to
port), a DTMF Receiver Unit (RRCS-4, -8, or
-12) must be installed on common control unit
(RCTUA, RCTUB, RCTUBNBB, RCTUC/D).
4.6.1 RSTU, RSTU2,
Options
The RSTU and the PSTU support the following
hardware options:
Internal Options
Install the R48S on the RSTU or RSTU2 in
accordance with the following procedure.
1. Remove the R48S from its protective packaging.
2.
Remove the RSTU from its protective packaging.
,
Note:
RSTU connectors P6 and P7 are positioned to
allow installation of the R48S only in the
proper position (Figure 4- 18 and 4-20).
a
PSTU or RSTU
and Hardware
PSTU
In
Figure 4-1 8
3. Mate the R48S connectors P6 and P7 (Figure
4-18 and 4-20) with the R48S connectors P6 and
P7.
External Options
Configure the PSTU1 and PSTU2 ring generator for
following procedure:
1. Remove the PSTUl or PSTU2 from its protective
.
packaging
2. Ensure the W1 switch is set to the "H" (190V P-P)
position for initial installation. The "L" (130V P-P)
position is used i f devices connected to the
PSTUl or PSTU2 experience ring trip.
Standard telephone message waiting lamp control
4.6.2 RSTU, RSTU2,
Procedures
Install the RSTU, RSTU2 or the PSTU (PSTU1, and
The protective shield on the back of the
RSTU or PSTU is designed to protect the
installer from potentially hazardous ring
voltage. Do NOT remove this shield.
2. Ensure the SSTS or SSTU subunit is securely
attached to the RSTU or PSTU (Figures 4-19 and
4-20).
3. Configure the RSTU or PSTU for options per
Subsection 5.5.1.
4. Insert the RSTU or PSTW into the appropriate slot,
and apply firm, even pressure to ensure proper
mating of connectors.
and PSTU Installation